Makes perfect sense to me - that's why I sold the Studio Bass AND my Hiwatt DR103! To me, nothing sounds more like bass than old Ampegs.
You won't get an argument out of me. I love all three of the amps you mentioned, but if I did a side by side comparison and had to make a choice, I'd probably be sittin' here with an SVT
I grew up playing Ampeg for 20 years or so and for me the B-15, B-18 and SVT are still the gold standard. The first two are a bit underpowered for most situations today,the third is too freakin' heavy and they're all too damn expensive these days. But yeah, they have THE bass sound down
Rick